Why the Exposition of the Scriptures is Important

It is important - no, it is vital - to faithfully expound the Scriptures. We do not uncover God's glory in Scripture with our weak, thematically driven, topically motivated  and textually dusted "therapeutic deism." Solid exposition is needed. John Piper says this well in A Peculiar Glory. Commenting on 2 Corinthians 4:4, Piper says: 

... The glory of God that marks the Scriptures as divine is manifested through the meaning of the writings. I emphasize this because, among other reasons, it seems to be one of the implications of Paul's words in 2 Corinthians 4:4, when he refers to the "light of the gospel of the glory of Christ." The "glory of Christ" shines its "light" into our hearts (v.6) as the "light of the gospel." But this is not the light of the Greek letter epsilon, upsilon, or any other isolated letters or isolated words. The "gospel" stands for a historical complex of events and the meaning those event have in the purpose of God" (p. 155, italics original).